Mechanical telephone



(No Model.)

R. O. MIDDLETON.

MECHANICAL TELEPHONE.

N0. 336,731. Patented Feb. 23, 1886.

WITNESSES WMM Attorney N. pinzas, mmmmnpw, wmangmn. n c.

UNITED STATES PATENT OFFICE..

ROBERT O. MIDDLE'ION, OF OAMDEN POINT, MISSOURI.

MECHANECAL 'lEl.EPllC NEn SPECIFICATION forming part of Lettere Patent No. 336,731, lated February 23, 1886.

Application fllcfl September 1,8, 1854.

To @ZZ whom it may conceive:

Be it known that I, Roemer O. MIDDLE'roN, a citizen of the United States ot America, residing at Camden Point, in the county of Ilatte and State ot' Missouri, have invented certain new and useful Improvements in rlelephones; and l do hereby deel-are the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or iigures of reference marked thereon, which form a part of this specification.

My invention has reference to telephones; and it consists in the improvements hereinafter described and explained.

In the accompanying drawings, forming part of this specification, Figure l is a side View of my improved telephone, and Fig. 2 is a central sectional view.

A represents a vertical board, which is designed to support the telephone proper, but is isolated therel'rom by means of a series of knobs, a. The telephone proper consists of an annular band or section, B, which has se cured to its front and rear sides, respectively, diaphragms O D, which form between them a sound-chamber, E.

F represents a section secured on the front of the annular band B, and is formed to pre sent the mouthpiece G, contracted toward its inner portion, and an enlarging' resonating chamber, II.

I represents the lineaire, which passes through a perforation, c, in the board A, and through an opening in the diaphragm C, and is attached to the shank of a pin, J, located centrally in the diaphragm D. The portion of the pin J located in the resonating-cliamber H is formed to present a button, d. A tube, K, is located in the band B, with its en larged portion extending in the direction of the central chamber, E, its smaller or contracted portion projectingl beyond the said ring for the attachment thereto of one end of Serial No. 143,407. (Xo model.

a tleXible tube, L, the other end of which carries a suitable listeningtube,M. Aspring leaf or reed, e, is secured at one end in the flaring portion f of the tube K, and extending centrally into the chamber E parallel with the diaphragms O D, andis perforated for the passage of the wire I. The mouth-piece G being constructed and contracted as described, the soundwaves will be directed against the center of the diaphragm D, which, with the wire I, will be vibrated in a manner well understood. The said wire I plays freely through the diaghragm C and reed e; consequently when the said wire is vibrated from the other end of the line the diaphragm D will be vibrated, which vibrations will alternately rarefy and condense the air in the chamber E, so as to positively act onV the reed and enable the listener to readily detect, through the tube M, the message. Vhen it is desired to summon the party at the other end of t-he line, the knob d of the pin J is tapped several times,

which Will result in the wire I operating the diaphragm of the other instrument.

I claiml. The combination, in a telephone, of a body portion, an opening therein communieating with alisteningtube, diaphragms C D, suitably secured to the said bodyportion, a reed secured at one end in said opening, and a line-wire connected to said diaphragm D, substantially as set forth.

2. The combination, in a telephone, of a body portion, an opening therein communieating with a listening-tube, diaphragms O D, connected to said body to form an air-chamber, a reed located in said air-chamber, and a line-wire connected to diaphragm D by pin d, and passing through the reed and diaphragm C, substantially as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

ROBERT O. MIDDLETON.

Witnesses:

W. A. LOWE, ARCH MATTHEY. 

